On Jan. 15. 1999, the U.S. Centers for Disease Control and Prevention’s (CDC) Advisory Committee on Immunization Practices (ACIP) the American Academy of Family Physicians (AAFP), and the American Academy of Pediatrics (AAP) announced they had narrowed the recommended options for the use of poliovirus vaccine and have endorsed the use of the newly licensed oral, tetravalent rotavirus vaccine.

In addition, recommendations were revised or clarified for the use of hepatitis B vaccine in infants born to hepatitis B surface antigen (HBsAg)-negative mothers, the use of diphtheria and tetanus toxoids and acellular pertussis vaccine (DTaP), and the use of Haemophilus influenzae type b (Hib) conjugate and DTaP combination vaccines for infants aged 2, 4, and 6 months.